Hi west1 and welcome.
First of all, I am so sorry to hear of your mom's dx.:( I too offer my thoughts and prayers for her, you and your family.
Experiencing the illness of a loved on can be a huge trigger for one's own anxiety...especially health anxiety
In our Resources (see link) you will find suggestions for self-help specifically for HA. Look into doing the work/coping skills and see if you find relief (let me know if you have trouble finding the health anxiety links, and I will be happy to post them directly to you)
https://www.healingwell.com/community/default.aspx?f=9&m=104206
You may also want to consider seeing a therapist, or joining a group (for those caring for loved ones with ALS) to help you through this journey.
Post anytime with us for support. We understand and care!
Scaredy Cat